msxml3: Treat input BSTR as general WCHAR string for ::loadXML()

[Vitaliy Margolen]

On 03/14/2010 02:08 PM, Nikolay Sivov wrote:
> http://bugs.winehq.org/show_bug.cgi?id=22020
> 
> Some applications don't bother to pass properly allocated BSTR as a ::loadXML() parameter,
> so we crash on invalid length taken from DWORD before passed pointer.
> 
Some tests verifying this would be nice. Also you might as well rename
bstr_to_utf8() to represent what it's doing.

Vitaliy.